So I just ran the class final at Indy.......
 

The other Racer is running the exact combo as I am (I know pretty far fetched but stick with me). We both go fast. We both get an invite to the barn. Tech inspector first checks both carbs. His carb checks OK for throttle bore and venturi as per the guide. My carb checks too small but is the correct # carb for the combo as per the guide.
His carb is way too big for the # of the carb that is listed in the guide. My carb is way too small for the numbers listed in the guide (plus .005 or minus .015) but it has the correct PN as listed.
Who gets tossed? Why?

Re: So I just ran the class final at Indy.......
 

Way to easy Billy. If both carbs do not meet the specs... both get bounced.. if valves are to small you would get bounced. if dish cc's are to small you get bounced. not in specs... not legal

Re: So I just ran the class final at Indy.......
 

Billy, being from the carolina's an also run there. The answer 's
is,,the guy with the biggest gun.....(just kidding)...

Correct answer is the spec. Size of the carb. That's specified, but not "bigger". If the guy with the smaller carb. Is faster, better look
for a vacuum leat above the throttle blades or some mods. To the booster cluster.... (old trick)

Re: So I just ran the class final at Indy.......
 

Billy, you would never be in that situation because you would have known in advance that the specs were wrong and had them corrected. If this actually did happen you probably would get bounced. His carb is legal and yours is not.

Re: So I just ran the class final at Indy.......
 

Billy would never have the wrong size carb, but why would a carb larger be OK?

Re: So I just ran the class final at Indy.......
 

The larger carb checks OK per NHRA specs.

Re: So I just ran the class final at Indy.......
 

But Bob, the guide is contradicting itself. Why should a competitor be tossed for using the correct, OEM carb?

Re: So I just ran the class final at Indy.......
 

You definitely should not be tossed, but I'm guessing that you would be. Both can not be right and his is correct according to NHRA specs. I may be wrong. I usually am. Maybe they would not disqualify either of you.

Re: So I just ran the class final at Indy.......
 

He has more $ than you and Regularly takes the tech officials out for dinner and drinks sorry Billy your tossed

Re: So I just ran the class final at Indy.......
 

so is this a actual situation that happened or just a hypothetical ?

Re: So I just ran the class final at Indy.......
 

I think you are try to slow your car down so you don,t get HP. But how big is big and how small is small.I once torn down down by Wayne Lewis and was told my carb was to small, that all that was said. You do not have a problem if your camber cc are to big or your runners are to small. Merry Christmas To all. Tom

Re: So I just ran the class final at Indy.......
 

I would think if your if your Stocker had unaltered intake or exhaust runners that CC'ed less than spec., or combustion chambers that CC'ed larger than spec it's obvious you are not grinding and bead blasting or using acid on your heads. I would also think if your carb had the right unaltered part number on it and measured smaller than spec. It left the factory that way. With either scenario IMHO it's obvious no one is trying to cheat. Correct me if I'm wrong but you are not required to run the factory lift on the camshaft in Stock, you just can't exceed it. If a Super Stock cylinder head guru finds out by putting epoxy and brass in the right places and making the runners smaller the car gets faster. If they hold less CC volume that spec. will the head get tossed. Just curious, Don Jackson

Re: So I just ran the class final at Indy.......
 

The key as my brother wrote is there is a plus and minus number for the carb. Cam lift only plus would be bad. BP

Re: So I just ran the class final at Indy.......
 

Both are out. I think

Re: So I just ran the class final at Indy.......
 

Also if you are doing your homework you are going through a pile of cores to find the biggest that stays within specs, if being told it's too small you didn't do your homework.

Re: So I just ran the class final at Indy.......
 

"plus .005 or minus .015", and "max" or "min" size, CCs, CI, lift or whatever are 2 different specs.

Numbers can be counterfeited and parts can be machined/modified.

Re: So I just ran the class final at Indy.......
 

Billy, I'm surprised at you. Surely you know that the reason specs became so important is because people were mucking with "correct part number" parts.

Re: So I just ran the class final at Indy.......
 

To answer your question Garrett, no that exact scenario has never happened to my knowledge. BUT, a close acquaintance of mine was at a Divisional race a couple of years ago and was "spot" checked. The Tech Man wanted to see his carb and he complied. The carb on his combo was the ONLY number listed for his combo and (in fact) was the original carb for the car. Tech Man measures carb, carb comes up WAY (WAY WAY) too small, Tech Man wants to know why his carb is so small. When acquaintance tells Tech Man that it is the original and correct carb, the Tech Man doesn't toss him but tells him not to come to another race with THAT carb on the car.

Now, sorry for getting long-winded but the reason I wrote this is I was having a conversation with another acquaintance of mine yesterday and one of MY combos came up. Now, said combo will run MUCH better with a smaller carb on it but the original, correct numbers carb (I have it) is a big carb. The problem is that the NHRA throttle bore and venturi spec are for the small carb.
Do I run the "correct" carb or do I run the "in-correct" carb with the smaller specs? If I use the "correct" # carb, I take the chance of being tossed for too big a carb. If I run the "correct" spec carb, I take the chance of being tossed for too small a carb. In a situation where the guide contradicts itself, I really am not sure just how the chips might fall.

Now when you're thinking of the correct answer remember, I'm the guy who was tossed at Indy once because my heads looked "too stock".

Re: So I just ran the class final at Indy.......
 

Billy, I don't see how you could have a problem if your carb meets NHRA specs. But you really should be discussing this with NHRA.

Re: So I just ran the class final at Indy.......
 

[QUOTE=Billy Nees;604497]To answer your question Garrett, no that exact scenario has never happened to my knowledge. BUT, a close acquaintance of mine was at a Divisional race a couple of years ago and was "spot" checked. The Tech Man wanted to see his carb and he complied. The carb on his combo was the ONLY number listed for his combo and (in fact) was the original carb for the car. Tech Man measures carb, carb comes up WAY (WAY WAY) too small, Tech Man wants to know why his carb is so small. When acquaintance tells Tech Man that it is the original and correct carb, the Tech Man doesn't toss him but tells him not to come to another race with THAT carb on the car.

Now, sorry for getting long-winded but the reason I wrote this is I was having a conversation with another acquaintance of mine yesterday and one of MY combos came up. Now, said combo will run MUCH better with a smaller carb on it but the original, correct numbers carb (I have it) is a big carb. The problem is that the NHRA throttle bore and venturi spec are for the small carb.
Do I run the "correct" carb or do I run the "in-correct" carb with the smaller specs? If I use the "correct" # carb, I take the chance of being tossed for too big a carb. If I run the "correct" spec carb, I take the chance of being tossed for too small a carb. In a situation where the guide contradicts itself, I really am not sure just how the chips might fall.

Now when you're thinking of the correct answer remember, I'm the guy who was tossed at Indy once because my heads looked "too stock".[/QUOTE

run the carb that the spec calls for in the nhra specifications guide ,, if you have information that can prove the correct carb along with throttle bore and venturi ,contact nhra tech official and plead your case
have both carbs on hand at your next divisional race and let them decide


I also haven't seen any +/- spec on carb bores or venturi's

Re: So I just ran the class final at Indy.......
 

"Too Stock" ...................

Re: So I just ran the class final at Indy.......
 

I was under the impression that NHRA tech really doesn't pay that much attention to carb numbers anymore, just the specs. To easy to change on some carbs. If you have an original carb that doesn.t match specs I guess you would have to plead a case with NHRA to get spec changed. Wouldn't plead a case if the wrong spec helps me though! Merry Christmas!